What changed between the last time you didn't get this error, and the first time you did get this error?
There are two likely causes for this error:
1) ob_start() is being called inside an existing ob_start(), this is pretty unlikely because it'd break everything for everyone
2) the output buffering is running out of memory mid-buffer, if this is the case the error you showed will be followed by another one complaining about exhausted memory
It's also possible that you have some local changes that have somehow managed to mean ob_start() is caused twice, but that's pretty unlikely. You can find any possible local changes with "svn status"
Thanks,
adam.
Henrik Aarfeldt via observium wrote on 24/03/2025 05:32:
Morning,
##### Observium #####
o Version 25.3.13962
o Train rolling
o Released 20th March 2025
o Subscription User aarfeldt-3723
##### Software versions #####
o OS Linux 5.15.0-134-generic [amd64] (Ubuntu 22.04)
o Apache 2.4.52
o PHP 8.1.2-1ubuntu2.20 (OPcache: DISABLED)
o Python 3.10.12
o MySQL 8.0.41-0ubuntu0.22.04.1 (extension: mysqli 8.1.2-1ubuntu2.20)
o SNMP NET-SNMP 5.9.1
o RRDtool 1.7.2
o Fping 5.1 (IPv4 and IPv6)
o Fetch PHP fetch
##### PHP info #####
o Memory Limit Unlimited
o Math NATIVE
##### DB info #####
o DB schema 497
o MySQL binlog OFF
o MySQL mode NO_ENGINE_SUBSTITUTION
##### Charset info #####
o PHP UTF-8
o MySQL utf8mb3
##### Timezones info #####
o Date Monday, 24-Mar-25 06:31:16 CET
o PHP +01:00
o MySQL +01:00
--
Med venlig hilsen
Henrik Aarfeldt
IT-specialist
Drift > Driftsstyring > Overvågning
Overvågning + SårbarhedsKortlægning + NetværksKvalitetsMålinger + Elastic.
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Mail:
Henrik.Aarfeldt@RegionH.dk
Region Hovedstaden
Center for IT og MedicoTeknologi, CIMT
Borgervænget 5
2100 København Ø
Ferie uge 17.
Hi,
you need to show versions (or screenshot of about page, or from cli)
./discovery.php -VV
It seems you use the not latest version, because the function indicated in the error is in another line.
I can't reproduce or see such error.
Henrik Aarfeldt via observium wrote on 21.03.2025 11:40:
Hi,
We're running the latest version of Observium.
Today we get "PHP Fatal error: html_callback_build_title(): Cannot use output buffering in output buffering display handlers in /opt/observium/html/includes/functions.inc.php on line 130"
Returns a blank page (after ok login)
--
Best regards, Henrik.
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